linux-kernel - Re: [PATCH V3 0/7] PM / Domains: Implement domain performance states

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Message-ID: <m237ekrhok.fsf@baylibre.com>
Date:   Fri, 10 Mar 2017 12:38:19 -0800
From:   Kevin Hilman <khilman@...libre.com>
To:     Viresh Kumar <viresh.kumar@...aro.org>
Cc:     Rafael Wysocki <rjw@...ysocki.net>, ulf.hansson@...aro.org,
        Nishanth Menon <nm@...com>, linaro-kernel@...ts.linaro.org,
        linux-pm@...r.kernel.org, Stephen Boyd <sboyd@...eaurora.org>,
        linux-kernel@...r.kernel.org, robh+dt@...nel.org,
        rnayak@...eaurora.org, lina.iyer@...aro.org
Subject: Re: [PATCH V3 0/7] PM / Domains: Implement domain performance states

Viresh Kumar <viresh.kumar@...aro.org> writes:

> This series contain V3 of both the bindings and the code that implement
> them. They were sent separately earlier.
>
> Some platforms have the capability to configure the performance state of
> their power domains. The process of configuring the performance state is
> pretty much platform dependent and we may need to work with a wide range
> of configurables.  For some platforms, like Qcom, it can be a positive
> integer value alone, while in other cases it can be voltage levels, etc.

Why limit it to just voltage levels.

As I suggested earlier, I think this should use OPPs.  Remember that a
PM domain is not limited to a hardware power domain, but is just a
grouping mechanism for devices that share some PM properties.  As
mentioned by Geert, this can also be a clock domain, where frequencies
would make sense as well.  One can imagine using this type of PM domain
to manage an interconnect/bus which has scalable voltage/frequencies as
well.

Kevin